A) \[C{{l}_{4}}\]
B) \[{{K}_{2}}S{{O}_{4}}\]
C) \[NiS{{O}_{4}}\]
D) \[FeS{{O}_{4}}\]
Correct Answer: D
Solution :
Key Idea: As we go down the group, it becomes difficult to separate electrons present in s sub-shell of valence shell. It is called inert pair effect. The inert pair effect increases as we go down the group. \[\therefore \]\[Pb\] is last member of group\[14.\] \[\therefore \]Among \[C{{l}_{4}},\,\,Ge{{I}_{4}},\,\,Sn{{l}_{4}}\]and\[Pb{{I}_{4}},\,\,Pb{{I}_{4}}\]has doubtful existence.
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